feat: add support for windows MAC hex dump

[ecigar13]

Reason for Change:
The net.ParseMAC function does not support windows MAC address, which is a hex dump without delimiter, so we make a wrapper to add colon : delimiters to the MAC address before parsing if it doesn't have any delimiter.

Issue Fixed:

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• relevant PR labels added

Notes:

[Copilot]

Pull Request Overview

This PR adds support for parsing Windows MAC address format from IMDS, which returns MAC addresses as hex dumps without delimiters (e.g., "00005e005302" instead of "00:00:5e:00:53:02").

• Introduces a new parseMacAddress helper function that detects hex dump format and adds delimiters before parsing
• Updates test data to include a Windows-format MAC address to verify the new parsing logic
• Maintains backward compatibility with standard delimited MAC address formats

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
cns/imds/client.go	Adds parseMacAddress function to handle Windows hex dump MAC format by detecting undelimited strings and inserting colons before parsing with net.ParseMAC
cns/imds/client_test.go	Updates test data to include a Windows-format MAC address ("00005e005302") to validate the new parsing capability

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[kadevu]

/azp run Azure Container Networking PR

[azure-pipelines]

Commenter does not have sufficient privileges for PR 4122 in repo Azure/azure-container-networking

[ecigar13]

/azp run Azure Container Networking PR

[azure-pipelines]

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